59 lines
1.6 KiB
ArmAsm
59 lines
1.6 KiB
ArmAsm
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2013 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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.code32
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.text
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/*
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* stack layout after pushad:
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* +------------+
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* | save stack | <-- esp + 0x28
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* +------------+
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* | new stack | <-- esp + 0x24
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* +------------+
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* | ret addr | <-- esp + 0x20
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* +------------+
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* | eax | <-- esp + 0x1c
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* +------------+
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* | ecx | <-- esp + 0x18
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* +------------+
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* | edx | <-- esp + 0x14
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* +------------+
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* | ebx | <-- esp + 0x10
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* +------------+
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* | orig esp | <-- esp + 0x0c
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* +------------+
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* | ebp | <-- esp + 0x08
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* +------------+
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* | esi | <-- esp + 0x04
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* +------------+
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* | edi | <-- esp + 0x00
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* +------------+
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*/
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.globl switch_to_thread
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switch_to_thread:
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pusha
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/* Save the current stack */
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movl 0x28(%esp), %ebx
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movl %esp, (%ebx)
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/* Switch to the new stack. */
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movl 0x24(%esp), %eax
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movl %eax, %esp
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popa
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ret
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